Even if a tiny little dog had flown directly from the collie show to the U.K. and been somehow smuggled into England, it could not have immediately infected hundreds of dogs with parvovirus! (thedogplace.org)
Dogs with parvovirus become thin and weak. (1800petmeds.com)
Other shelters have a better than 90 % rate of saving dogs with parvovirus. (whypetaeuthanizes.org)